Catechism of Agricultural Chemistry and GeologyW. Blackwood, 1844 - 48 páginas |
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Página 18
... keep up the supply ? A. By ploughing in green crops , -by growing clo- vers , and other plants which leave long roots in the soil , -by restoring all the hay and straw to the land in the form of manure , or by laying down to pasture ...
... keep up the supply ? A. By ploughing in green crops , -by growing clo- vers , and other plants which leave long roots in the soil , -by restoring all the hay and straw to the land in the form of manure , or by laying down to pasture ...
Página 22
... keep the plant in an upright position ; and , second , it supplies the plant with inorganic food . Q. The inorganic part of the soil consists chiefly of sand , clay , and lime ; does it contain no other substances ? A. Yes , it contains ...
... keep the plant in an upright position ; and , second , it supplies the plant with inorganic food . Q. The inorganic part of the soil consists chiefly of sand , clay , and lime ; does it contain no other substances ? A. Yes , it contains ...
Página 28
... keep up the fertility of his land - perhaps for ever . Q. How much of every thing must the farmer put into his land to keep it in its present condition ? A. He must put in at least as much as he takes out . Q. To make his land better ...
... keep up the fertility of his land - perhaps for ever . Q. How much of every thing must the farmer put into his land to keep it in its present condition ? A. He must put in at least as much as he takes out . Q. To make his land better ...
Página 29
... keep the sods so near the surface that the roots of the young corn could feed upon the decaying grass . Q. Are any other plants ploughed in green for the purpose of manuring the soil ? A. Yes , clover , buck - wheat , rape CHEMISTRY AND ...
... keep the sods so near the surface that the roots of the young corn could feed upon the decaying grass . Q. Are any other plants ploughed in green for the purpose of manuring the soil ? A. Yes , clover , buck - wheat , rape CHEMISTRY AND ...
Página 31
... wheat ? A. I would then rather have my straw more loose and unfermented . It would help to keep my land open . Q. What are rape - cake and rape - dust ? A. Rape - cake is the refuse that remains when CHEMISTRY AND GEOLOGY . 31.
... wheat ? A. I would then rather have my straw more loose and unfermented . It would help to keep my land open . Q. What are rape - cake and rape - dust ? A. Rape - cake is the refuse that remains when CHEMISTRY AND GEOLOGY . 31.
Palavras e frases frequentes
AGRICULTURAL CHEMISTRY ammonia animal require applied bone-earth bones burns called carbon and water carbonic acid gas CHEMISTRY AND GEOLOGY Chlorine clover common salt compost consist of carbon contain cow-dung crops cwts draining dung earth EDINBURGH employed fall to powder farm-yard manure farmer fattening fermentation fertile give gluten grass lands grow guano gypsum hydrogen inorganic kind of air large quantity leaves LECTURES ON AGRICULTURAL light lands lighted taper limestone liquid magnesia marl mixed nitrogen oats obtain oil of vitriol organic food organic matter oxide of iron oxygen gas phosphate of lime phosphoric acid plants require potash potatoes produced profit proportion pupils quicklime roots sea-weed shell sand Silica slaked smell soda soil consists sour starch straw subsoil substances sulphuric acid supply taste teacher may exhibit teacher may illustrate teacher will show turnip usually vegetable waste wheat white fumes wood woody fibre
Passagens conhecidas
Página 17 - Q. Whence is the organic part of the soil derived? A. It is derived from the roots and stems of decayed plants, and from the dung and remains of animals and insects of various kinds. Q. Does this organic part form a large proportion of the soil ? A. Of peaty soils it forms sometimes three-fourths of the whole weight; but of rich and fertile soils it does not usually form more than from a twentieth to a tenth of the whole weight. Q. Can a soil bear good crops which does not contain a considerable...